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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9796c28722c19d02ae0c9ef5fbecc8078c1a9d54ef412d273643178767838098' 
  AND token = 'RpvnBJekdRPYAZr4Ya3jH8RZyvVx8lYI70mDVwEBjl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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