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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3511da14507ee207aba487553a767266e76da29997e733f56c7b261ef449ccb8' 
  AND token = 'VLRjAkGovgJE9/QaAHb/jvJrB52bW1p84ErJ4HUcMHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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