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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3449ac844f66ab7cab8310ffdb69c12165d5a06ea16f6b3a0f0efb510f1771' 
  AND token = 'nDOBfyq3OO3KLrOt5IYhAhvsDrBib0pKF33Mb1//xwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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