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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b6fe26369dc213668027a9f454cf967a7cdc6ff0ee0e07be483b02cb2b2ede' 
  AND token = 'v7Ov9D/JLu2ctJrK1r3bIjsl++Jz35IxfoICrnU0OqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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