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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793c6b7c1b304161c66d1ad5dc4d41daf152e7aa5fe3420d7f4c639b3d6675dd' 
  AND token = 'nORBaJ4pGr4zdicTSe6Qbjn17QC2R8QvbD5fA2BLUH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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