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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6a94f177cd27a9b095ad1eeaa07778ec970707814dd5dd315523fa82c4a1b1' 
  AND token = 'x7qCg2vKuWIzGUXDQTyW8avcFiI9uDTgJKiFIDgZrZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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