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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29a12e5003b160eaddefbd5c6df68cba1e9ea00d0566718ca797f17c0119e3db' 
  AND token = 'kX9UhZr8np0W5IWUep7vqf40CtiKrJoSNJAXPPpC9AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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