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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7adf7f69839ff51c35d065a9f1ba8f4dd9bec1dd62bf181da57b188b166a5f' 
  AND token = 'Ik9YZTHzYEewt+I5Auh0i/H0jqaDAYlwl+a28HK65BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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