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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0059b36cf5b064144423fa7e77bcc0a8f19c399ac44c163926ac1d131a63fa' 
  AND token = 'KP0/Q8Xmnw26SY0pdWuJV95qMd35cS9TFkusvvAFy9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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