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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92079b3ad3181ce218d91c870a96e68b5ebf7fb310873e3d4e0ca5aa3f7058a1' 
  AND token = 'RYtHcw9mS+hBWCUOJDt0hujfGdoc6A3l8oeXM7yxsrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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