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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e560c88d62cff38ccf3e684e4898af6f00f6c8081ecb9d1b0bb9bce68bc1e6' 
  AND token = 'lGt7ct/6VMNessh1nMmVp9pe9frqeH8JVTAkv3i7Y6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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