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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc26988b6b68ad22fec18aaad09652c86eeb070fb49191ef902816916d0be13f' 
  AND token = '7YRHvd+OIgaycA78Pu2I/Ydb9mLlAJW+mvK884uuFKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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