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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd385c240a700b0d0f916d2431ed985669572c24cbbd7de3719bce41017b4dc4' 
  AND token = 'hEiffib682biBW98dfOpNloJTC2UtLkHyO6Ijoq51pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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