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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fdb5b1a8c4f54ad04ea526cba5770026efe1575496ca7fae8a5d7ebec41b915' 
  AND token = 'fJyA/EI/mfVPZtpU0cqD7PGoIGtBTfUUkiJoFH8ivKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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