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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b882328ebd9f53b19a4b81ce922c718ffdc389d92c1119f5521fea69328039' 
  AND token = 'OSFO3NMKNwid6ij70W8YizE7cEkecb6M4G5ui2s8cq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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