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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0962264cce4fd3c42f720bf3ca84b5e2f2ef71726d8290164cd8fe7e59b21a4' 
  AND token = 'WQ3fSueeSl98fvHAzUyneY7nQuxHaQy9kQ53VcgMZtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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