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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e31d5dac86f98f364aa19fd0f9ba911e7ae4c9bb10e09ea39fdb9f3c9026cb' 
  AND token = 'wceuQLJX707ySUsgDFRwKJmIURC8AUdovoY3922k4pQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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