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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9062a701d868d4c198810dd35484d7f183d971ee8b4c08c09868864b60d6add' 
  AND token = 'iNU9v+qTvudsU6VlsYKDzHT4NPwofC+HmGDOUSxYrQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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