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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f34d72d64b79b7ed545b15e8668572b73f46b5b5b2d6a36ed458674c02a6de0' 
  AND token = 'ijccvNDrORp5/vwW0CrkxGFkVCM1c7neRTFHz58QWHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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