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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14baf3b9de8b29dfadc46ade8346d5a8c86c848a14d53af47b84b159ec6ed1d' 
  AND token = 'FC2IaVvCd5NOf1vh5JzsY/YQfr7CbH/jzOzsoZyaG4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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