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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a562933982de79dae4c0c71d500f44329fbe12a5ab4c3dd9176386e530363031' 
  AND token = 'xXS60kWEAfqMYZV11NEFa8BGxWK6N55+9PGh9CkeYjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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