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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4097e083180b95c11bd40632c4e85d52fe54b16fb52e9e6d1e0b9c5df9cec939' 
  AND token = 'dzfZ8lFO+BIZW/+nxRU06dmx8JzveIx93ikgktHcVWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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