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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2694c19ef41f16b06fa01fb8bf3cf719b6d98480fe775a5c8aad6894c5cde4d' 
  AND token = '3rHQJu1DzvuMcAOLZ56TlocuNMwbXDs2GfA5+az21XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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