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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a62e2b3330986c38ab404356158f330aef47e587060550955eb2d72bbca163a' 
  AND token = 'Iup99CfT/b5q0N+26ILJsqg2NMpLYo5Jwo70dIOe1+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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