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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ec5804b5b3d344d945d510996413a224c85fefa8221429cb68b7076eaa9a44' 
  AND token = 'F7Z2JkmyefTCWsUrWxm2ZdTidCW73p43dD3OfKHW4Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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