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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063247c75cc97a3a5d2ec98548c846b14ee917e47dc0a94a9bf18b483bcf136e' 
  AND token = '6g6Hf6o+b3DP6CMfA6Q1eJuKZ7IpSY6gMURq6eHq+GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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