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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9842f5b30bc6c2ac06ffc445c926e00569543b63bab0f078b22025f61e4a206' 
  AND token = '++6XzIRiOja2qXpS9H+oHXgbyf/2wklWJ8otq+DLJK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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