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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fec4b8f6257b9997735774dfb7d6713b685082644b152b9e5b7eecf62af43fe' 
  AND token = 'H89or56ouW6kdzHeo3D656ZvCBAeMbfXDzFqFRQYOv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}