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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc4350ff031a2c545d6b9019e8af780c8513f03ae97a6500d5086bd6b807097' 
  AND token = 'VYsIHsGURw60FYId40v02fyv7KIlMj23MtVEMrjUWqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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