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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694c47748318fe973d525bcb94100abc2228c7d8b250d92bff74f3b96bb350fa' 
  AND token = '6U/xWlnAqcfrfGUh3MTwiLLDwh+IVij05FA8irnDd6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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