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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df9d4d958505ccb2e2fe3e04bac19ab6c940908377085c6702babc5e966c2bc' 
  AND token = '+WICLvXSAuVduW7RPDxO9FVfA1y//5iSgyPCPxyZli8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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