SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f7d930a1d8dc510a5cb51e66faf48946068e1f2e542daac1147ac4ce13a49b2' 
  AND token = 'lbx1LwEzsMFmLwC7HUCO4CXKLg/ZQUh8FYZWUyppE2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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