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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ef05240aad5426b17105bc6c5e5656f8d89037492c8d10cfc453aca3a84dbc4' 
  AND token = 'IypDriOrYuSaK6QQFWGXlH5HLuu/y0jbNL/S2XQAD/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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