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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a674363dc5905c8965b64e7af9b6e14de5ad44fbd0812f55d9dfcbd25265405' 
  AND token = '6LMF6g3WyDXETIiQjLD4Fr6OJ2YZvbLWJhA9ZTO2IME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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