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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415a102c55d7824da8a8d5a5458b724190c87aaba1b7ff3f0ac76238ea78d586' 
  AND token = 'ddk6qve7rvgF2BEBhEmPSf+2AkYlVCnooIUQKJFi4ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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