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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb789a00be179f3cc97299a4da919c1499d5911871e3db8d61c250e10fdac4a4' 
  AND token = 'S4gK6xA7BQoc6WqrcKR4itO4RVH7iYKKOtNzLE92R3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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