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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85473e7343e54aec8ca92eb669cc1839d70d611e4e52bea964a7ba1f8ddd8386' 
  AND token = '4E91m1FAuTh4y+zeobNSO9aVmLhhZPs2vlwnEvoh4H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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