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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf511c5b645a7c4671f58f1682a22824828f9d74dc9d96341cf058d88730c5b' 
  AND token = 'kyq+OsFFaOfRy1qAnjhrHj1drNEYcmnbAJe1jlgFuMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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