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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfbb86b2f6f6dc424f3c42ffbb7c28139c11df70256f3b040361e76aaa94dcf' 
  AND token = '2Iy4nwmjrbbAlOWIvcReOtK/4gyM++WYqE4evmRimGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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