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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982e05a3884a8b7b7ac7550cdd257d2fcf94bb583c8a1ec556b7b3097e93c58d' 
  AND token = 'ftHgHaeUILEnfd3L58DoOr7OTaFTW7SDS6wI95qSY4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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