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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af6548284277483968f09a79d481066a3add983b5f8ffca59d267f674a072e6' 
  AND token = 'PYjj1ue8ipKvR8sP6zA8wTrMJr0piLoO873Dism+E9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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