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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c388c41af17c22373da1a7bb649e43c9225e0efbf8cbc9b9da77b0ea75df38df' 
  AND token = 'D17KhWau/iiLtpAVWZmqxIcPAt5dmsZ7gmrp2H1069Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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