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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56996907ca5dd55fd71b9d35657a70cd0c8e3ff9a18dfb8ff90f0fdf49a10be7' 
  AND token = '1PlKXzLeiYbjiyhp45H3DUeajFc8zJkLRHmKRiN85n8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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