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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716d984940b6be0ee081ddc65e3edc9370e08e127f79f5f178cedc70e7fafc93' 
  AND token = 'xPG1IeWQRKJy7/khtWoFu7ODK18Hg/W4+vCV0Ah35dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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