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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8b535b4db7dfac9d3faa6843fa375de4a639ff97509b57aef2d1a9f75daf82' 
  AND token = 'HNu6dR2nkx8C4Gk6Aakoxrq/NV2m9W9B14LWGMYkvNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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