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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415277660071b28c0b2ab189a3532c00c2ddcd3eac6086755e43c4d4ad6b4f58' 
  AND token = 'xij7WLXpi/zraq8kd/N8vcJDaLQuYy/cjSRtSmUwZN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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