Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f30d76ce0c2dff0bc5243fe88acbf0b194c4e79727a2e6c0925cb93a51f543' 
  AND token = 'ClQvR3+JI4kq7wnE6eOp/w9fR37SFctCPBQnWrOwvec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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