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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32c1dfa96cce6ff7c9781e1bfa0a9204f2d388d8ac6af6f3297b8ad7cd0e5f5' 
  AND token = 'A74mfZJscmtd3mPxj/8Pq4UPJZIAHPBj4bdv5LMQj5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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