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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db70984dbdc80de3b2a70f195ada56628b20501e788bdfe97d343c5bf9d6473' 
  AND token = 'JbM9UqltNpNhPoT8wPYJsnbGNMQyrgntp0Q6Z6E1aew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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