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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1656b4313e8d85b8200d957d6dd6b2be687ff03d64a850d812cf25dcd09d63e2' 
  AND token = 'moYYY8Q/xVKtSE1f4jwOf35YltUS6D9GCG1HTpGGlNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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