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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dadf63fbdd9d73f7f678336478a925d1e9ef8372f69596847ba7c7f8b965bd5a' 
  AND token = 'sSBks+Vi7ADN72w0z/9qnmgUTLEQ4mY5XMAuIszeWdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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