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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5de2ad8204bf05df0d6cef6f419a178dd5075d227c717158b7ac824d98337b0' 
  AND token = '7w74uDxkhWqfMg1cI4pjONWaD7rP/P3s+CN1l1FaKJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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