SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c9cd5c91f481446fbc9de880505740b3cef5f1c97034f3ceae9fa04872c9a6' 
  AND token = 'ByBuzM5lquRQUPX2jZvDXKkrWjrJllpHtkmhjZS59Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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