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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a99a91cb49c067367d6aa02c6c3f8ce68e24af7c03dccdea61a77c9f7e9693' 
  AND token = 'kXsAXmUc1aUITe2tSGubUZyHM8rXGo56LWfy1QBZdKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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