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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05e01524e8bdedf97874d383a9c3f6c41a9374e58c86de9c90e893809e73fa6' 
  AND token = 'EOyVs1esa8YCvWUeW9yb93iDBT+viOviba2lop2ltqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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