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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0634093756302dbe634d8f0df491f8e7e1a3a4f68012979a1c2474082898f476' 
  AND token = '8ikAEZ/KTGrE+HwMazHjoTJBvIE0vZ0y8g5EvRMm24M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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