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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec13e8428a603c7c720e9a2f9819776716f6f709dee0987d9157a36db0c399e' 
  AND token = '3x4HSVOxiPgFMYR9GEy302Xrsmtn8GqLEj3PpDTkaog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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