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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec17e17c622cf9de1dc95738ae9c0ec1ab939f861327f3766e6ec93ae32fa91' 
  AND token = 'RUonCVgoObtl4T05Bvhhke2toQa+Ro2TNIHboUmpBLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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