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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf9188bc9626e0e3ce4cc0cfb17a8b0cd2a6901debe420106ac82b7f745a1b6' 
  AND token = '8V8g5lKzsBQuwLWxo20A6O8DnZtAUfT868fgO97qNWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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