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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4764862c4dc4bc1c939bfdebbccb65308e5f9b77e74e52c111b8cb60314c9f' 
  AND token = 'EQFr+n39CaY0bvYY56PasTfipgznYXJJ4pWFF2soN7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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