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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c376eeac13f59a64b911c955318dd910c8134c923d4dafc7d44e949b485c1c' 
  AND token = '6XrO3zqBuA6GBYMh8SFM67m+JcryfckaNR7TpZt77uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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