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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '783c075850ad2442eebadb36702e35f3930a70429d942bf018b8b66fa0ac7de6' 
  AND token = 'v9c8PijaE/lfVgxgG0goBVOR49gueDZ0RT6g6c6H3FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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