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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95d4597a3c44184062677138990a65a490f5ff4a6217bca202450ad5a2b7198' 
  AND token = '0jLBeGSiE9qCHNT4V1UIUT9wpcylgsKG6ACFgm2Je+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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