Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421b1c6bd872e2778bbfedc6e228bb1c612e013fecac6b2b05d2982474e8665f' 
  AND token = 'GvJA4BN9wr/l5djbU4rOBtgDBU0+NOnIJIZsom6a4hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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