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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19ff073a044e38ca422c907cd3c190a1cb2122c2fd35ea8692e68a1c39c23c1' 
  AND token = 'AWDLIKNhoWNGX7OQIIY4shCu6+1HmqU16oH2jqcYW1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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