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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf34ec06d71d93c9988c8a6719f35c37224bede43ca0e8ed31f27c79d61853b4' 
  AND token = 'Ag7VvyERUX5/Vuhd0q8O48fHrI6gM5CikETOvHQ/RlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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