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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2d39eb5ad5745802d52a564f9d2e56dda62e76862fdbff1575edcf7e90db8b' 
  AND token = 'KtgKMXptzIkNISNsvLNdU9Ltx9S9Cev14mkoT/cHJec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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