SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '907a736f0b1dadbc71363c04735f496dca3f64548a9e12aa6f50c17204c267a8' 
  AND token = 'F4tmw8+2wavGfNehZ26BuUtAmRhjJJ/kLbOLcMRZAbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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