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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6cecc5f43ab50b9b1288655df176e8c6dd6c85d0120efa7bfec7ede27a01e6' 
  AND token = 'iT9SqUhOiD/TNcz0sJoNoUauuRFhTNHto33Cil0gTj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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