SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aec139fc2e7fcd2e685dc617642c006d2b44abd6169fd22a2de465f3e915037' 
  AND token = 'LW1lq/VVMKZfk01uKFxi+YTHRs6Gz0LD2LGvTJtA3vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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