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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3645babca890f3f3ec6cbdf7039cc52f3695afd94339e67e0dc7b02e11de2f2' 
  AND token = 'GSQ+0rFWNI3wc8SLSfLK8ej4Jv8c9M6jGBlxsCa/8aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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